Rotary pump



G. B. PETSCHE.

ROTARY PUMP.

APPLICATION FILED SEPT. 25, 1920.

Patented May 31, 1921.

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GUSTAV B. PETSCHE, OF YONKERS, NEW YORK.

ROTARY PUMP.

nascent.

having rotary eccentric ring pistons provided with an extension forming a partition between the admission and discharge sides of the pump in connection with an oscillating shoe articulated to the piston extension and moving in a bearing having the form of a segment of a cylinder. The chief object of my invention is to provide a pump of this kind with a valve which will close the admission port during the period/ when the eccentric ring piston is passing from the close of its propelling cycle to the beginning of its intake cycle to prevent a free passage between the discharge and suction pipe. A further object of my invention iS to cheapen the costof such pumps by so locating the cylindrical bearing of the shoe that it can be bored out in a boring mill.

The nature of my improvements will be best understood as described in connection with the drawings in which they are illustrated and in which Figure 1 is a side elevation of my improved pump taken on the section line, 1-1 of Fig. 2.

Fig. 2 is a front elevation of the pump partly in section on the line 22 of Fig. 1.

Fig. 3 is a view similar to Fig. 2 showing the parts in the position they occupy when the admission valve is closed.

Fig. 4 is a face view of the pivoted lever on which are formed the shoe and the admission valve.

Figs. 5 and 6 are diagrammatic views illustrating modifications of my invention.

A and A indicate air pump cylinders formed in the same casting and provided with face plates, A and B indicates the cylindrical face of thepump cylinder interrupted at B where the delivery port is located and at B where'it is intersected by the bearing C. C isa cylindrical bearing for the shoe and valve to be described. D is the delivery port of the ,cylinder and E the admission port, the admission port Specification of Letters Patent.

Patented May at, test.

Application filed September 25; 1920. Serial at. 412,822.

being formed, as shown, in the bearing C.

F is the driving shaft of the pump to which is secured the eccentric F on which work the eccentric ring .pistons G having arms G extending between the delivery and admission ports of the pump and articulated at K to a sliding shoe J which moves on the cylindrical bearing C'being carried by an arm I pivoted at H. L is a similar arm'supporting the admission valve M.

Referring to Fig. 5, C indicates a cylindrical bearing. M a slide which serves both as a shoe and as an admission valve; this slide being supported on the lever I L pivoted at H and necessarily extending in this case without perforations between the side walls of the bearing. The extension G of the piston being pivoted to the arm I and K.

In the modification shown in Fig. 6 the cylindrical bearing is indicated at C D indicates the admission port and M a slide whichserves both as a shoe and admission Valve being pivoted on the center H by means of a lever L The piston extension G is articulated to the valve at K".

. In operation the piston rotates in a clockwise direction and it will be observed that inpassing through the part of this path indicated in Fig. '3 that is after the completion of the propelling cycle and immediately before the be inning of the second pro.- pelling cycle, t e piston leaves contact with the face of the cylinder on both sides but immediately before leaving contact with the cylinder at the point B the'valve H closes the admission port E and keeps it closed until the piston has contacted with the cylinder on'the opposite side at or about the point B In this way any backward flow of fluid is prevented. It will be obvious that what I have said as to the construction of Fig. 1 is equally true of the constructions shown in Figs. 5 and 6, though I might point out the construction of Fig, 5 is not considered desirable by me for the reason that it involves subjecting the pivot H to the full pressure of the delivery side of the pump. 1 I locate the bearing C which is in theform of a segment of a cylinder in such relatlon cylindrical bearing therewith an inlet valve actuated by the rock I claim as new and desire to secure by Letters Patent, is: l

1. In a rotary pump having a cylinder with admission and exhaust ports and a bearing surface in the form of a section of a cylinder formed in a chamber connecting said ports, a rotary eccentric ring piston having a partition blade extending from it, a rock lever pivoted in the center of the cylindrical hearing, a shoe movable in the cylindrical bearing and attached to the rock lever and an articulated connection between the shoe and the blade extending from the piston and serving as a partition between the ports or". the pump, the novel feature which consists in forming surface and combining lever and having its movements timed as described so as to close the port through that portion of the cycle when the piston is not in contact with the bore of the cylinder.

the inlet port in the leader-Le 2. In a rotary sump having a cylinder with admission and exhaust ports bearing surface in the form of a section cl .7 a cylinder formed in a chamber connecting said ports, a rotary eccentric rin ciston having a partition hlade extending iiorc. a rock lever pivoted in thecenterof cylindrical hearing a shoe movable cylindrical hearing and attached to the rock: lever and an articulatedconnection betwe n the shoe and the blade extending; from piston serving as a partition between the portsof the pump, the, novel feature which 1 consists in proportio-ning and locating the segmental cylindricalhearing as described and so that the cylinder of which i forms a segment will intersect the pump cylinder only at a segment which is cut away to leave clearance for themovernents of the blade extending from the piston and so at bearing can be faced in a horin mill.

GUSTAV n. rs'cnr, 

